<html>
  <head>
    <script type="text/javascript" src="calculator.js"></script>
  </head>
  <body>
    <center style="margin-top: 10em; font-face: trebuchet; font-size: 16pt;">
      <input type="text" size="4" id="a" style="font-size: 16pt;" value="0">
      <select id="op" style="font-size: 16pt;">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="/">/</option>
      </select>
      <input type="text" size="4" id="b" style="font-size: 16pt;" value="0">
      <b>=</b>
      <span id="result">0</span>
    </center>
  </body>
</html>
